ARL, Analytical Research Labs. HTMA is a screening test that measures 21 minerals and toxic metals present in a sample of hair. A hair tissue mineral analysis reflects long term metabolic activity as it measures an average of mineral accumulation over a 3 month period of time. It can be used to assist in identifying mineral patterns which may be associated with stress, blood sugar and carbohydrate imbalances, metabolic rate, biochemical energy production and glandular imbalances. It does not provide an assessment of the mineral content of other tissues of the body.